High-strength, heavy-wall steel tubes engineered for demanding mechanical, structural, and pressure-containment applications. Produced via hot-rolling mills with strict dimensional control to minimize machining allowance and ensure consistent wall thickness.
Hot-Rolled Thick-Wall Steel Tubes provide high structural integrity and load-bearing capacity for heavy industry. Designed for components requiring extensive machining, deep drilling, or high-pressure resistance, these tubes reduce raw material waste and shorten processing cycles.
Manufacturing Method: Hot-rolled (Seamless / Welded options available based on specification)
Size Range: Outer Diameter (OD) 50 mm to 820 mm; Wall Thickness (WT) 6 mm to 120 mm
Standard Length: 5.8 m, 6 m, 11.8 m, 12 m, or cut-to-length as specified
End Finish: Plain ends, beveled ends, or threaded
Specifications
|
Steel Grade |
Standard |
Yield Strength (min) |
Tensile Strength (min) |
Elongation (min) |
|
ST52 / E355 |
EN 10305 / EN 10025 |
355 MPa |
490 - 630 MPa |
22% |
|
AISI 4140 / 42CrMo4 |
ASTM A519 / EN 10083 |
655 MPa |
850 MPa |
14% |
|
E355 + SR |
EN 10305-1 |
450 MPa |
550 MPa |
10% |
|
A519 Grade 1026 |
ASTM A519 |
310 MPa |
485 MPa |
15% |
Material & Manufacturing
Mill processing parameters and metallurgical controls determine tube performance under stress.
Raw Material Feed: Continuous cast billets sourced from integrated steel mills with strict chemical composition verification.
Piercing & Rolling: Rotary piercing mills maintain concentricity, controlling wall thickness deviation within tight mill tolerances (±10% max eccentricity).
Heat Treatment: Normalizing, quench and temper (QT), or stress relief (SR) conducted in continuous roller-hearth furnaces to achieve uniform microstructure and mechanical properties.
In-House Processing Capability: Equipped with heavy-duty peeling, cold drawing benches, and precision cutting lines to reduce buyer machining stock.
Quality Inspection
Every production lot undergoes rigorous destructive and non-destructive testing prior to dispatch.
Non-Destructive Testing (NDT): 100% Ultrasonic Testing (UT) in accordance with SEP 1925 / ASTM E214 for internal defect detection.
Dimensional Verification: Laser outer diameter measurement and multi-point ultrasonic wall thickness gauges.
Mechanical Testing: Tensile testing, Charpy V-notch impact testing at low temperatures, and Brinell/Rockwell hardness tests per lot.
Metallographic Analysis: Grain size and inclusion rating examined via optical microscopy.
Documentation: EN 10204 3.1 Mill Test Certificates (MTC) supplied with every shipment.
Applications
Engineered to serve as foundational raw materials for high-stress industrial components:
Hydraulic Cylinder Barrels: Heavy-duty earthmoving, mining, and agricultural equipment actuators.
Slewing Bearing Rings: Large-scale rotation mechanisms for cranes and wind turbines.
Mechanical Engineering & Transmission: Heavy-duty spindle sleeves, hollow drive shafts, and machined gear blanks.
Energy & Offshore: Offshore drilling components, structural support pillars, and high-pressure pipeline fittings.
Automotive & Commercial Vehicles: Axle tubes, chassis components, and steering linkages.
Customization & Supply
Custom Dimensions:
Non-standard outer diameters and heavy wall thicknesses rolled to order.
Surface Protection & Condition:
External anti-rust oil, phosphated coating, black varnish, or rough-peened surface to reduce machining stock.
Packaging:
Bundled with steel strapping, wrapped in waterproof woven plastic, or packed in wooden crates for export.
MOQ & Lead Time:
Flexible minimum order quantities based on stock availability; mill production runs typically require 30 to 45 days.
FAQ
Q: What is the maximum wall thickness you can supply?
A: Wall thickness depends on the outer diameter and steel grade, with a maximum capacity up to 120 mm for select OD ranges. Share your specific drawing for evaluation.
Q: How do you control wall thickness eccentricity?
A: Hot-rolling parameters are monitored using online laser gauges, and rotary piercing alignment is calibrated per shift to maintain wall thickness tolerance within standard limits.
Q: Are Mill Test Certificates provided?
A: Yes. Every shipment includes an EN 10204 3.1 certificate detailing chemical composition, mechanical test results, and NDT verification.
Q: Can you supply tubes cut to exact lengths?
A: Yes. Precision cutting, chamfering, and rough peeling services are available to eliminate on-site processing steps.
Q: What is the standard packaging for export?
A: Tubes are bundled securely with steel bands, protected with end caps, and wrapped in moisture-resistant material to prevent transit damage.
Q: What inspection standards do your tubes meet?
A: Inspection complies with international standards including ASTM A519, EN 10305, ISO, and DIN, verified by internal QA labs.
Request a Quote
Provide your specifications below to receive a direct mill quote with lead times and test documentation samples.
Required Outer Diameter (OD): __________ mm
Required Wall Thickness (WT): __________ mm
Length: __________ mm
Steel Grade / Standard: __________
Quantity: __________ Metric Tons / Pieces
Required Condition: [ ] Hot-rolled raw [ ] Rough-peened [ ] Cut-to-length
Target Delivery Port: __________
[Submit Inquiry / Contact Technical Sales]
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